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(170 Model.)

A. W. K'URZ. ROTARY BLOWER, EXHAUSTER, 0R PUMP. No. 571,770.

Patented N0,v..24, 1896.

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A: W. KURZ.

ROTARY BLOWER, EXHAUSTER, 0R PUMP. 7 N0. 571,770. Patented Nov. 24,1896.

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UNITED STATES ATENT siren,

AUGUST .V. KURZ, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO JOHN P. DOWD, OF SAME PLACE.

EXHAUST'ER, OR PUlVi P.

SFEGIFICATION forming part of Letters Patent No. 571,770, dated November24, 1896.

Application filed February 1896. Serial No. 578,086.

(No model.)

To all whom, it may concern:

Be it known that I, AUGUST XV. KURZ, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented certain new and useful Improvements in Rotary Blowers,Exhausters, or Pumps, of which the following is a full, clear, and exactdescription.

My invention relates to rotary engines employed in forcing air, gas, orliquid in one direction; and it consists of the several parts andcombinations of parts hereinafter fully described and especiallyclaimed;

The object of my invention is to provide a rotary blower, exhauster, orpump of the class designated above which is strong, durable, andeconomical in construction and operation, of larger working capacity,and more steady and even in operation than similar engines of the samesize.

My device is so constructed that the gears are easily accessible and theupper revolver is rendered adjustable in order to obviate wear at theends. The revolvers have perfect contact with each other throughouttheir entire revolution, so there can be no backward escape of theelement acted upon. The gears can be exposed without disturbing orinterfering with any part of the engine except the end plate of thegear-casing, which is practically independent of said casing and therevolver-case, although bolted to the former when in position andsupported in part by the latter. My construction lessens the wear andtear of the engine in several respects, thereby prolonging the life ofthe same.

That my invention may be seen. and fully understood by those skilled inthe art, reference will be had to the following specification andannexed drawings forming a part thereof, in which Figure 1 is an endview and partial section of my engine, the end plate of the gear-casingbeing entirely removed; Fig. 2, a side elevation and partial section ofsaid engine; Fig. 3, a diagram illustrating the gain in capacity of myconstruction over those using annular gears; Fig. 4:, a side elevationof one of the end sections of one of the revolvers; Fig. 5, an end viewof the same; Fig. 6, a side elevation of one of the intermediaterevolver-sections; Fig. 7, an end view of the same; Fig. 8, a sideelevation and partial section of one of said revolvers, and Fig. 9 anend view of the same.

Similar letters and figures of reference designate like parts in thedrawings and specification.

The ovally-shaped case A is provided at both ends, top and bottom, withthe flanges 1, to which the plates '2 and 3 are secured. The plates 2and 3 terminate at their bases in the feet 4c and 5, which support thecase A. The horizontal flange 6 projects from the outer face of theplate 2 to form with said plate and the end plate 7 a casing for thegears 8 S. The shafts 9 and 10, which carry the abutting revolvers B 13,pass through openings in the plates 9 and 8, said openings beingaccurately located in said plates to retain said revolvers in therproper relative position.

The plates 7 and 3 are respectively provided with the ball-bearin gs 11and the conebearings 12. After the revolvers B have been placed in theshell A the end plates and are bolted or riveted into place, with therear ends of the shafts 9 and 10 resting in the rear bearings 11 and 12.Now secure the gears S to the shafts 9 and 10 outside of the plate 2,place the plate 7 against the flange 6, with the front ends of saidshafts in the corresponding bearings ll. and i2, and boltsaid plate tosaid flange.

Integral with the plate 2, below the base of the flange 0, is thebracket 13, between which and said flange is the extension 7, integralwith the plate 7. The extension 7 projects beneath the flange 6 nearlyto the plate 2, and the Babbitt or other soft metal filling 14 is pouredonto the bracket 13 to fill the space between the same and saidextension, thus forming a bed for the plate 7 and rendering the removaland replacing of said plate easy and convenient.

The cone-bearings l2 permit the shaft 10 to be accurately adjustedlaterally and serve to keep the same in place when so adjusted. A finelateral adjustment for the shaft 9 is had by means of the set-bolts 15in each bearing 11. It is very essential that the ends of the revolversB should not come in contact with the plates 2 and 3, and I readilyprovide against such an occurrence, in connection with the upperrevolver, by the use of the bolts 15, which bear against the ends of theshaft 9 and may be turned from the outside to adjust saidshaft withgreat nicety. The shaft 10 is driven by the pulley 16 on the front endthereof, and owing to the fact that power is thus directly impartedthereto and because of its heavy cone-bearings quick means of adjustmentof the same are not so essential as with the shaft 9.

As before intimated, the peculiar eonstruction of the casing for thegears 8 renders said gears easily accessible by simply removing theplate 7 and attached bearings with the pulley 6, without being obligedto block up the front of the case A, as in some engines of this class,ordisturbing anyother members except those just enumerated.

The case A has the inlet-opening 17 and the outlet-opening 17 inopposite sides.

I use the intermeshing oval gears 8 instead of annular gears on theshafts 9 and 10, and am thereby able to gain an increased capacity, aswill be seen by referring to Fig. 3. "he dotted line 0 indicates thepitch-line of an annular gear and the dotted lines I) indicate arevolver operated thereby. The pitch-line of one of the oval gears 8 isrepresented by the full line 8 and the outline of one of the revolvers Lby the full line B. I11 order to insure perfect contact between therevolvers of a device of this kind, the junction of the major and minorconvex curves of each of said revolvers should cut the pitch-line ofeach gear midway between the intersections of radii with saidpitch-line, said radii to pass through the gear-center at right anglesto each other and be in line with the respective major and minordiameters of the revolvers. The right-angle radii in Fig. 3 arerepresented by the lines o and (Z, and the junction of the major andminor convex curves of the dotted revolver intersects the gearpitch-linea at e, or half-way between the intersectingpoints f and g of said radiiwith said pitchline, four points 6 appearing, of course, on eachrevolver. The junction of the major and minor convex curves of therevolver-outline 13 cuts the oval pitch-line 8 at 71, or nearer thehorizontal radius (Z than the point e. Hence the revolver having an ovalgear is flatter than the revolver having an annular gear, less room isoccupied thereby in the ease, and an increased capacity for receivingand forcing out air, gas, or liquid is provided. The points it aremidway between the intersections 2' and j of the radii c and (Z with.the line 13.

A further very important advantage of employing oval in place of annulargears lies in the fact that a change of speed ensues at each revolutionof the former, said change occurring when the positions of the revolversare such as to produce the best results, as

will appear from the following explanation.

The motion of the lower gear 8 on the shaft 10 is constant; but becauseof the oval shape of said gear and its companion their relative motionis not constant, one traveling at :1 greater speed than the other duringtwo iiternate quarters of the revolution and at it less speed during thetwo intermediate qua rters. When the gears 8 and the revolvers B are inthe position shown in Fig. 1, the shaft 9, with attached members, isdriven at a less speed than when the position is reversed, and two ofthese changes take place at each revolution of the parts. Now if air,gas, or liq; uid be taken into the case A at the opening 17 anddischarged at the opening 17 and the revolvers B rotate in the directionindicated by the arrows in Fig. 1, it will be seen that the relativespeed of said revolvers 1s faster at the instant of induction when theelement acted upon is of a less density and slower at the instant ofexpulsion when said element is of a greater density. This quad ruplechange of speed at each revolution of the revoluble parts causes myengine to work in a more steady and even manner and thus produce betterresults than can be obtained in the old way.

Each revolver B consists of the steel-plate sections 18 and the endsections 19 and 20. Four sections 18 are shown in the drawings: but thisnumber may vary to acccommodate the length of the revolverB to that ofthe case A. Each section 18 consists of the plate 18 and the wideperipheralflange 18", and has the shoulder 18 at one end, onto which theflange of the contiguous section is shrunk when the metal is in a heatedstate. The end section 19 consist-s of the plate 19 and the narrowperipheral flange 19", extending into the contiguous section 18, theflange 18 of which is shrunk onto the same, and the opposite end section20 consists of the plate 20 and the wide peripheral flange 20 which isshrunk onto the shoulder 18 of the contiguous section 18. The completerevolver I3 is perfectly smooth on the outside and combines theadvantages of being easily con structed and very durable.

An opening for the shaft 0 (or 10) is provided in the center of thesection-plates 18. 19, and 20, around which are the flanged collars 21,bolted or otherwise secured to said plates. The collars 21 are shrunkonto the shaft 0 (or 10) while in a heated state, and thus render a veryrigid connection between the latter and the revolver 13.

hat I claim as my invention, and desire to-sccure by Letters Patent, is

1. The combination in a revolver for rotary blowers, exhausters orpumps, of a series of flanged transverse sections assembled in line, ashaft, and means for rigidly attaching said sections to said shaft,substantially as and for the purpose set forth.

2. The combination in a revolver for rotary blowers, exhausters orpumps, of a series of flanged and shouldered intermediate and flangedend sections peripherally shrunk togetller, a shaft, and means forrigidly atcaching said sections to said shaft, substantially as and forthe purpose set forth.

The combination in a revolver for rotary blowers, exhausters or pumps,of a series of flanged and shouldered intermediate and flanged endsections peripherally shrunk together, a shaft passing through thesection-

